I did my better game on Noble and by Space Race around 2030 and it was just amazing, I had more than 15 cities in some point and conquered most of the new world, but it broke my budget, anyway I tried to be the more peacefully is possible but I had no success, all my neighbors excluding the Persians were my enemies and they attacked me several time and had success conquering one of my cities which I get back later.
I get a lot of resources around my cities what make a boost on my economy principally because they were food resources and it grew my cities! I end with 3 cities in the top 5, also end with most population and territory.